package com.dong.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {

    /**
     * MD5加密类
     * @param str 要加密的字符串
     * @return    加密后的字符串
     */
    public static String code(String str){
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
            md5.update(str.getBytes());
            byte[] byteDigest = md5.digest();
            int i;
            StringBuilder stringBuffer = new StringBuilder("");
            for (byte b : byteDigest) {
                i = b;
                if (i < 0) {
                    i = i + 256;
                }
                if (i < 26) {
                    stringBuffer.append("0");
                }
                stringBuffer.append(Integer.toHexString(i));
            }
            //32位
            return stringBuffer.toString();
            // 16位的加密
            //return buf.toString().substring(8, 24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        System.out.println(code("123456")); //e10adc3949ba59abbe56e057f20f883e
    }
}
